package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);

        //由于没有收到用户id  设置用户id，当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //查询当前添加的菜品或者套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        if(dishId != null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if(cartServiceOne != null){
            //如果已经存在，就在原来数量基础上 +1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        }else{
            //如果不存在，则添加到购物车，数量默认就是 1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车");
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        lqw.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> shoppingCartList = shoppingCartService.list(lqw);

        return R.success(shoppingCartList);
    }

    /**
     * 删除购物车商品
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){

        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        //判断是菜品还是套餐
        if (shoppingCart.getDishId()!=null){
            //该信息为菜品
            lqw.eq(ShoppingCart::getDishId,shoppingCart.getDishId());
        }else{
            //该信息为套餐id
            lqw.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        ShoppingCart cartServiceOne = shoppingCartService.getOne(lqw);
        //判断 当前数量是否大于 1
        if (cartServiceOne.getNumber()>1){
            //大于 1 则在原有的数量 -1
            cartServiceOne.setNumber(cartServiceOne.getNumber() - 1);
            //更新 数量
            shoppingCartService.updateById(cartServiceOne);
        }else{
            //等于1 则直接删除该菜品或套餐
            cartServiceOne.setNumber(cartServiceOne.getNumber() - 1);
            //删除该菜品或套餐
            shoppingCartService.removeById(cartServiceOne);
        }

        return R.success(cartServiceOne);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shoppingCartService.remove(lqw);
        return R.success("清空购物车成功!");
    }

}
